<template>
    <el-container class="home-container">
        <!--头部区域-->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!--页面主体区域-->
        <el-container>
            <!--侧边栏-->
            <!--适应折叠改变宽度-->
            <!--<el-aside width="200px">-->
            <el-aside :width="isCollapsed ? '64px':'200px'">
                <!--导航栏折叠-->
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!--侧边栏菜单区域-->
                <!--
                     active-text-color="#ffd04b" 激活文本的颜色
                     unique-opened或者:unique-opened="true" 是否只保持一个子菜单的展开,默认false
                     router 是否使用 vue-router 的模式，启用该模式会在激活导航时以 index 作为 path 进行路由跳转-开启路由模式
                     default-active	当前激活菜单的 index	string
                    -->
                <el-menu
                        background-color="#333744"
                        text-color="#fff"
                        active-text-color="#409bff"
                        unique-opened
                        :collapse="isCollapsed"
                        :collapse-transition="false"
                        router
                        :default-active="activePath">
                    <!--一级菜单-->
                    <!--原：<el-submenu index="1-4">-->
                    <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
                        <!--一级菜单的模板区域-->
                        <template slot="title">
                            <!--图标-->
                            <!--原 <i class="el-icon-location"></i>-->
                            <i :class="iconObj[item.id]"></i>
                            <!--文本-->
                            <!--<span>一级导航栏</span>-->
                            <span>{{item.authName}}</span>
                        </template>
                        <!--二级菜单-->
                        <!--原：<el-menu-item index="1-4-1">-->
                        <!--原二：<el-menu-item :index="subItem.id + ''" v-for="subItem in item.children" :key="subItem.id">-->
                        <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children"
                                      :key="subItem.id"
                                      @click="saveNavState('/' + subItem.path)">
                            <template slot="title">
                                <!--图标-->
                                <i class="el-icon-menu"></i>
                                <!--文本-->
                                <!--<span>导航一</span>-->
                                <span>{{subItem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!--右侧内容-->
            <!-- 原 <el-main>Main</el-main>-->
            <el-main>
                <!--路由占位符-->
                <router-view/>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
    export default {
        name: "Home",
        data() {
            return {
                //左侧菜单数据
                menuList: [],
                //定义自定义图标对象
                iconObj: {
                    //id当作key,id对用的图标当作value
                    '125': 'iconfont icon-user',
                    '103': 'iconfont icon-tijikongjian',
                    '101': 'iconfont icon-shangpin',
                    '102': 'iconfont icon-danju',
                    '145': 'iconfont icon-baobiao'
                },
                //是否折叠（false不折叠，true折叠）默认不折叠
                isCollapsed: false,
                //被激活的链接的地址
                activePath: ''
            }
        },
        created() {
            this.getMenuList();
            this.activePath = window.sessionStorage.getItem('activePath');
        },
        methods: {
            logout() {
                window.sessionStorage.clear();
                this.$router.push('/login');
            },
            //获取所有的菜单
            async getMenuList() {
                const {data: res} = await this.$http.get('menus');
                //失败的情况下
                if (res.meta.status != 200) return this.$message.error(res.meta.msg);
                this.menuList = res.data;
                console.log(res);
            },
            //点击按钮，切换菜单的折叠与展开
            toggleCollapse() {
                //切换状态，自身取反
                this.isCollapsed = !this.isCollapsed;
            },
            //保存链接的激活状态
            saveNavState(activePath) {
                window.sessionStorage.setItem('activePath', activePath);
                this.activePath = activePath;
            }
        }
    }
</script>

<style lang="less" scoped>
    .home-container {
        height: 100%;
    }

    .el-header {
        background-color: #373D41;
        //
        display: flex;
        //左右贴边对齐
        justify-content: space-between;
        //清除container的内边距
        padding-left: 0;
        //退出按钮居中
        align-items: center;
        //改变系统文本颜色
        color: #fff;
        //文本大小
        font-size: 20px;

        > div {
            display: flex;
            align-items: center;

            span {
                margin-left: 15px;
            }
        }
    }

    .el-aside {
        background-color: #333744;

        /* 左侧导航栏去除右侧突出边框*/

        .el-menu {
            border-right: none;
        }
    }

    .el-main {
        background-color: #eaedf1;
    }

    /*设置图标和标题之间的距离*/
    .iconfont {
        margin-right: 10px;
    }

    .toggle-button {
        background-color: #4a5064;
        font-size: 10px;
        line-height: 24px;
        color: #fff;
        text-align: center;
        letter-spacing: 0.2em;
        cursor: pointer;
    }
</style>
